Dear readers and authors!





"Proceedings of Gubkin Russian State University of Oil and Gas" is a collected volume containing leading edge contributions in fundamentals and applications of oil and gas science.

The journal is published quarterly.

The scope of research papers includes the following topics: Geology, Geophysics; Drilling, Development, Production; Transportation, Storage; Processing, Chemistry of Oil and Gas; Computerized Control Systems, Modeling of Oil and Gas Production; Economics, Management.

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This publication is the property of Gubkin Russian State University of Oil and Gas and its reproduction by any means without the consent of the University is prohibited.

Recent issue № 2/287, 2017

Sedimentation features of Minghuazhen formation Miocene series in Shanxi oilfield of China
Based on detailed correlation of well logs in shanxi oil field china and analysis paleosections show that sedimentation of Minghuazhen formation happened under alternate dip of adjacent tectonic blocks and their limiting faults are synsedimentary. Analysis of thickness maps also indicates the presence of block tectonics
Generation Potential of Oligocene-Miocene Sediments of Cuu Long Basin
The article is devoted to the research of the generation potential of Oligocene—Miocene sediments of the Cuu Long basin on the basis of the results of digital modelling of the generation-accumulation system. The main oil-and-gas source rocks of the basin have been studied. These are represented by fine-grained sediments of the lake-marsh facies of Oligocene age and contain rich amount of organic matter as well as type I and II kerogen. Currently, the source rocks reach maturity threshold at the depth of around 2700-2900 m, the depth of the oil window ranges from 3100 to 3400 m, the dry gas window occurs at deeper than 5500 m. According to the results of the pyrolysis analysis of the core samples and sludge samples, organic matter of Lower Miocene source rocks has not yet reached maturity to generate hydrocarbons, except for the submerged parts of the central depression where organic matter has partially reached such maturity thresholds. 3D modeling of the generation-accumulation hydrocarbon systems helped to build distribution maps of vitrinite reflectance values (Ro %) in the Cuu Long basin. On the basis of the digital model, created with a PetroMod petroleum systems modeling software, the zone of distribution of hydrocarbon deposits is forecasted
Modelling of geo-fluid pressures within the Sakhalin shelf
Based on the results of the simulation with respect for the assessment of the changes in the compaction of rocks and their filtration-capacitance properties and density the zones of abnormal pore pressures are identified in the section of the Prisakhalin shelf. The results of the log-derived pore pressure estimation by the equivalent depth method are presented. The results of modeling are compared with the data obtained by various methods and direct borehole measurements. The influence of neotectonic processes on the distribution of pressures is estimated. The effect of unloading zones on the process of formation of abnormal pore pressures zones is estimated. The difference in the distribution of pore pressures was established within the Kirinsky license area, in the South Ayash structure and in the Piltun-Astokhskoye field
Mineralogical features of Osinskiy horizon carbonate reservoir rocks of Nepsko-Botuoba anteclise
The main carbonate deposits rock types of Osinskiy horizon of Nepsko-Botuo- ba anteclise were distinguished and characterized. The detailed mineralogical analysis of distinguished lithotypes, which was perfomed by the methods of x-ray diffractometry and microprobe analysis, detected a wide spectrum of authigenic minerals, such as halite, anhydrite, ankerite, graphite, cuboargyrite etc., in limestone and dolomite rocks. The ankerite formation mechanism was validated. The absence of direct correlation between potassium anomalies in Osinskiy horizon basement and presence of clay minerals were determined. The minerology of intervals with increased radioactivity values was characte-rized
Geodynamic Evolution of South-Eastern Part of East European Platform to Estimate Prospects for Oil and Gas
Another interpretation of the geological structure of the Donbas, the Caspian cavity and the relationship of the southeast of the East-European platform with the surrounding Scythian, Turan plate is offered in the article. The presented ideas about the peculiarities of the geological structure, development history and its oil and gas potential indicate the important role the geodynamic processes which took place there
Analysis of factors affecting productivity of fractured horizontal well in tight gas formations (a case study of reservoirs in Western Sichuan, China)
An analytical model was used to analyze the affect of factors on the productivity of fractured horizontal gas well in formations with permeability of about 0,1 mD. The following factors were considered: fracture width, fracture half-length, the number of fractures and fracture permeability. It was shown that unlike conventional low-permeability reservoirs, fracture permeability in tight formations has limited effect on the well productivity, whereas fracture half-length and the number of fractures are the main affect factors. It is noted that increasing fracture width thousands of times has no effect on the well productivity, and therefore, mesh simplification for numerical simulation of fractured horizontal wells in such formations was proved feasible
Thermohydrodynamical tests of gas wells in the conditions of hydrate formation
The technique of interpretation of the results of thermohydrodynamical tests of gas wells in the conditions of hydrate formation. It is proposed to implement standard procedures on the phase diagram to construct a curve of phase equilibrium hydrate-gas-water measurements buttonhole temperatures and pressures, which is based on the dependence of the buttonhole temperature from the pressure. The first mode is to determine the coefficients Joule-Thomson at decrease and increase of pressure at reservoir conditions, and then the phase diagram predicted subsequent studies in «no hydrate formation» mode
Gasdynamic research on Kushevskoe UGS. E.M. Kotlyarov
The technology of gas dynamic studies of horizontal wells of the Kushchevsky UGS and determining the coefficients of the filtration resistance ag and bg is analyzed. Horizontal wells of the Kuschevsky UGS were studied according to the method of conducting research on vertical wells without taking into account the features for horizontal wells. It is determined that the actual operating time of the well in the test modes is not comparable to the required stabilization time, therefore pressures and flow rates are not stabilized. The use of classical technology for research on stationary filtration modes developed for vertical wells is impractical for horizontal wells. The article presents the existing methods for determining the coefficients of filtration resistance
Application of Aggregate Gas-Oil Block at Compressor Stations
The use of secondary energy resources in the natural gas transportation system is considered. The heat released into the lubrication oil of the gas turbine engine and the centrifugal compressor is lost in the atmosphere, although it can be effectively utilized.
Devices that regenerate the heat flow released into the oil have not been used at compressor stations of main gas pipelines yet.
A variant of generating additional electric power, cooling the oil and heating the fuel gas is proposed.
The main characteristics and operation mode of the aggregate gas-oil block are calculated. This device allows to bring the heat flow from the hot oil to the fuel gas supplied to the combustion chamber of the gas turbine engine.
An assessment of the economic effect of the implementation of this unit is also given.
Method of pressure gages calibration while operation of gas mains and their systems
A method of calibration of the measuring equipment designed for the current level of the gas-supply system information service. It uses standard measurements and does not require mounting additional diagnostic equipment. The method makes it possible to estimate systematic errors of measuring instruments during gas-supply systems operation. It is based on the algorithm of gas-supply system parameter identification. The mathematical model includes the identification of the following parameters: systematic errors of measuring instruments and coefficients of the technical state of gas-supply system objects.
Numerical experiments on multiline main gas pipelines demonstrated the method efficiency. Its inclusion in the specialized software will enable to improve the dispatching control of gas supply system.
Numerical modelling of soft soil stabilized by vertical drains for CaMau power plant construction project in Vietnam
The construction site of the CaMau power plant is located on a 17m thick layer of soft clay with very poor characteristics. The proposed method of increasing the load-bearing capacity of the soil is based on vacuum sealing and installation of vertical drains with surcharge in the form of a sand mound. The purpose of this paper is to construct a ground behavior model for installing vertical drainage to test the analytical solutions to the theories of Baron (1948) and Hansbo (1981) as well as application of this model under actual fill conditions on the field to determine the change in pore pressure, the degree of consolidation and forecasting the size of the draft of weak soils in the construction project of the Ka Mau station. The model is the basis for further study of the change in soil characteristics during vacuum consolidation. An acceptable coincidence was established between simulation results and analytical solutions.
The application of open integration platform to the development of heterogeneous distributed software
The article discusses the problems of the integrated information systems development in oil and gas industry, specifically the task of gas transportation dis- patching systems components integration. The evolution of architectural and technical approaches to the integration platforms development is analyzed, advantages and limitations of object-oriented and service-oriented architectures are considered. The proposed two-level implementation of service-oriented architecture approach allows integrating distributed software suites into the enterprise information infrastructure and organizing interconnection between their internal components. The structure of open integration platform allowing the consolidation of heterogeneous software suites as well as the creation of prerequisites for distributed calculations, cloud technologies, using of thin and mobile clients is proposed. The main functions of applied programming interface stan- dardizing data formats and protocols for the open integration platform is considered.
Mathematical model of computer simulator for trunk oil pipeline dispatchers
The problem of mathematical modeling of computer simulator as a multicomponent realization of VPTE concept with components installed on remote computers in a network is discussed. The simulator complex is represented as a set of cooperative Markov processes with discrete states and continuous time. A random processes interaction scheme is formed, the states of processes are detailed; differential equations systems, initial conditions, normalization conditions and relations between equation solutions are made up. In addition, the article describes computer simulator operating modes, for each mode it determines evaluation of the complex functioning reliability index i.e. the availability factor. In collaboration with UML-diagrams, the mathematical functioning model of the computer simulator provides a possibility to describe its working process, to evaluate the parameters of the underlying Markov processes and to estimate the availability factor value.
Behavior of oils from one oil field while selecting acid compositions for terrigenous reservoir treatments
Most of fields currently turn to the late stage of development, connected with decline of production and physical-chemical change of hydrocarbons. The article states in terms of five wells that acidizing efficiency could be decreased by various interacting between acid and crude oils from explored wells. These interactions can result in emulsions or precipitations, which cause problems in acid and colmatants interactions. This process deteriorates in presence of iron compounds in the bottom-hole area. Iron compounds take place because of ageing well stock. Thus, based on investigations it should be observed that before acid treatment it is necessary to check acid and oil compatibility individually for each case.